Morrissey is now taking issue with Live Earth, following a recent PETA statement claiming that event organisers say they have no control over venue concessions.

The musician wrote in an open letter published by Rolling Stone: "I am writing to ask you to do the one thing that will do the most good for the planet and the majority of its inhabitants: not serve meat or dairy products at Live Earth 2015.

"I don't mean offering a vegan option-I mean not serving animal products at all. Otherwise, the event will make no sense-it'll be 'greenwashing'. Serving meat and dairy products at an event to combat climate change is like selling pistols at a gun-control rally. Your responsibility is to alert people to a crisis, not sell out to the vendors responsible for it."

Morrissey went on to insist that a vegan-only option is possible and affordable, given that all venues where he performs worldwide are able to make those necessary change.

"If you choose to serve animal flesh at Live Earth, you'll be making a mockery of the very concept of the event, in which case it should be renamed 'Dead Earth: We Contributed'," he declared.

"Don't be a denier of the causes of climate change. You know the facts. Make the right choice."

The first Live Earth concert was held in July 2007, and featured Genesis, Keith Urban, Kasabian, The Black Eyed Peas, The Police, Madonna, Garth Brooks, Joss Stone, Jack Johnson, Rihanna, Yellow Magic Orchestra, Snoop Dogg and Lenny Kravitz performing at venues across the globe.